package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    // 微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    /**
     * 微信用户登录
     *
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) throws IOException {

        String openid = getOpenid(userLoginDTO);
        log.info("用户登录,openid:{}",openid);

//        如果openid为空，则抛出异常
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        User user = userMapper.getUserByOpenId(openid);
        if (user == null) {
            // 新用户自动注册
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now()).build();
            userMapper.insertUser(user);
            log.info("新用户,已经自动注册:{}",user);
        }

        return user;
    }


    private String getOpenid(UserLoginDTO userLoginDTO) throws IOException {
        //        向微信api发送请求
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode());
        map.put("grant_type", "authorization_code");
        String response = HttpClientUtil.doPost(WX_LOGIN, map);

//        解析返回的json字符串
        JSONObject jsonObject = JSON.parseObject(response);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
